转换波处理关键技术应用及效果  

Key techniques for converted-wave processing

作　　者：杨维[1] 王小卫[1] 冯会元[1] 边冬辉[1] 杨哲[1] 刘杰 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《石油地球物理勘探》2017年第A02期7-13,共7页Oil Geophysical Prospecting

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2016ZX05007-007)课题"天然气地球物理烃类检测;评价技术及应用"资助

摘　　要：GeoEast处理系统提供了丰富的多波资料处理技术,针对实际转换波资料处理过程中静校正、纵横波匹配、转换波速度建模、快慢横波时差提取的难点,应用转换波综合静校正技术大幅改善了转换波成像效果,利用井控纵波和转换波精细层位匹配技术获取了纵横波速度比,实现了纵横波层位的精确匹配,并通过转换波四参数叠前时间偏移速度建模技术得到合理、准确的转换波偏移参数场,最后使用横波分裂分析与校正技术进一步增强了转换波叠前时间偏移成像效果。应用结果表明,GeoEast多波处理技术能够满足转换波处理过程中的关键技术需求,通过纵横波资料相结合得到更丰富的转换波信息。There are a few difficulties in the converted wave data processing.GeoEast System provides a full range of tools for the multi-wave processing.Therefore we choose some approaches to the converted-wave data processing.First converted-wave data quality is greatly improved by integrated converted-wave statics.Then P-wave-to-S-wave velocity ratios is obtained by the horizon matching based on well-controlled P-wave and converted-wave,and PP-and PS-wave horizon matching is precisely achieved.After that,a reasonable migration parameter field is built by four-parameter velocity modeling in converted-wave prestack time migration.At last,the migration results are enhanced by the analysis and correction of shear-wave split.Our application results show that the approaches we use can meet requirements in the converted-wave processing and the result can provide much new geological information.

关 键 词：GeoEast多波处理 转换波静校正 纵横波速度比 转换波叠前时间偏移 横波分裂分析与校正 

分 类 号：P631[天文地球—地质矿产勘探]